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Earn +20 ptsQ: How many perfect squares are there between 20 - 30?
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What are the perfect squares of 1 and 20?
1 and 400.
How many numbers between 20 and 30 are perfect square?
4
What are the perfect squares of the whole number from 16 to 20?
16 => 256 17 => 289 18 => 324 19 => 361 20 => 400
Is there a perfect number between 20 and 30?
28 is a perfect number.
How many of the numbers from 1 to 20 can you express as the difference of two perfect squares?
Fifteen of them. All but numbers of the form 4n-2 = 2, 6, 10, 14, 18
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